//temeratuer sensor using LM 35 sensor.
//toggle"limit"switch enable pin"L2" on arduino pin 3 "as power switch"
//other two pin one"L1" with Gnd,and the other"COM" To Vcc
//Lm 35 have 3 pin , +Vcc,Gnd,out
//hooked up:
//connect pin one to +5v "from arduino board"
//connect pin two to A0 analoge input.
//connect pin three to Gnd
//LM 35 have a linearity curve
// it change 10mV for each 1 Celesus
//created by Mohannad Rawshdeh jan 23 2012

int power;

float sensor=0;
float input=0;//voltage read on pin 2
float celsius=0;
float fahrenheit=0;
void setup(){
Serial.begin(9600); 
pinMode(3,INPUT);
}

void loop(){
  power= digitalRead(3);
  if (power==HIGH){
    
  sensor = analogRead(A0);
input = (sensor*5000)/1024; // convert raw sensor value to millivolts       
celsius = input/10;         // convert millivolts to Celsius
fahrenheit = ((celsius * 1.8)+32); // convert celsius to fahrenheit
Serial.println(" sensor read");
Serial.println(sensor);
Serial.println(" --------------------------");
delay(1000);
Serial.print("Temperature: ");
Serial.print(celsius,2);
Serial.println(" degrees C");
Serial.print("Temperature: ");
Serial.print(fahrenheit,2);
Serial.println(" degrees F");
Serial.println("_ _ _ _ _ _ _ _ _ _ _ _ _ _  ");
delay (2000); // wait a second, otherwise the serial monitor box will be too difficult to read
  }
}